The newlyweds fight rumors of an unhappy marriage at her private bash — but was it all for the cameras?

Kim, now 31, and Kris, 26, had dinner at The Darby in New York City on Oct. 21, and HollywoodLife.com was there taking in all of the action!

The couple was joined by Kourtney Kardashian and Scott Disick, and both couples seemed to be super-happy throughout the evening. But it’s important to note that the cameras WERE rolling for their reality show, which makes us wonder — was this happiness just artificial?

Also at the party was Nick Lachey, La La Vazquez and even Pink, who thrilled the crowd with an impromptu performance of “Killing Me Softly with His Song!”

Perhaps the best part of the night was an amazing three-layer pink and white birthday cake with sparklers!

What do you think, HollywoodLifers — are Kim and Kris happier than ever or is it all just for show?